noun (n)

• an orgiastic festival in ancient Greece in honor of Dionysus (= Bacchus)(noun.act)

  Synonym:
  bacchanalia
  

  source: wordnet30
• Any of the festivals held in honor of the Olympian god Dionysus. They correspond to the Roman Bacchanalia; the greater Dionysia were held at Athens in March or April, and were celebrated with elaborate performances of both tragedies and comedies.(noun)

  source: webster1913